CVE-2026-53742Network attack vector

Stored XSS via unescaped embed shortcode attributes

Published Jun 10, 2026 · Updated Jun 10, 2026

Stored XSS in QuantumCloud Simple Link Directory 9.0.4 and earlier allows remote authenticated users to run script in viewers' browsers. The embedder template writes contributor-controlled shortcode values into HTML data attributes without context-appropriate escaping. Contributor access is required to store the payload, and a viewer must load the rendered directory content; execution is confined to that viewer's browser context.

CVSS severity5.1
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in QuantumCloud Simple Link Directory 9.0.4 and earlier allows remote authenticated users to run script in viewers' browsers. The embedder template writes contributor-controlled shortcode values into HTML data attributes without context-appropriate escaping. Contributor access is required to store the payload, and a viewer must load the rendered directory content; execution is confined to that viewer's browser context.

The record

CVE
CVE-2026-53742
Published
Jun 10, 2026
Updated
Jun 10, 2026
Vendor
QuantumCloud
Product
Simple Link Directory
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=9.0.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

QuantumCloud · Simple Link Directoryversion=0 <=9.0.4

Published CVSS scores

5.4VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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